Manager Bruce Bochywould not hazard a guess how long Brandon Belt will be out with recurring concussion symptoms, saying, "It's important we take care of Brandon."

Belt spent two weeks on the special concussion disabled list before he returned in New York. He seemed fine for several days, but felt ill during a four-strikeout game at Milwaukee on Wednesday night.

The Giants were hoping Belt merely was down with flu-like symptoms, but he was showing signs of post-concussion syndrome and flunked tests administered Friday by team physician Dr. Anthony Saglimbeni, a concussion specialist, who had flown in from San Francisco.

Head athletic trainer Dave Groeschnersaid that concussion symptoms returning like this is "not common, but it does happen."

The Giants anticipated Belt's return to the DL and had middle infielder Matt Duffyfly with the team to Kansas City after optioning him to the minors when they activated Angel Paganbefore Wednesday's game in Milwaukee.

Bat man: Bochy contemplated letting double grand-slam man Madison Bumgarnerbat and not use a DH, but felt Pablo Sandovalwould benefit from a night off his feet and had him DH. Sandoval incurred what Bochy described as a "nasty gash" on his left leg from colliding with a railing in New York.

"It's always a little different," Bumgarner said of pitching in an American League park. "You're in your routine. It's weird just coming in and sitting there."